Mark , Sport covers most publicliy insured martial arts venues  & teaching groups  I would say,  But vagnes of law which might be usefull in USA, means in England, you can be arrested for nearly any curved sword & a judge will decide & direct a jury in the manner he see fit. 
 
Thats why today  carrying a Leatherman in England gets one arrested for carrying an offensive weapon. {because a judge directed it so as a locking blade equaeled a fixed blade & was therfore illegal.} {Sadley 95% of police enforce the law in that manner as well.}  
 
I have a 50 year old, one inch long  blade mechanikal  locking knife  {by an unusual patented design.} that fits on a key ring & that i use to open parcels.  It is illegal to carry outside my front door in the UK. 
 
Spiral
		 
		
		
		
		
		
		
		
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